Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bbf777623fd9ec…

MALICIOUS

PDF

42.5 KB Created: 2020-08-04 10:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5d33aee5d4886ac336d3cac1f31fdbb SHA-1: 13dbb24c25d71d2efab56fa440317e39694a077d SHA-256: 49bbf777623fd9ec93950267acb61d4263bcded3f8aa0218faa903f5c3919fbc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, with the primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Appareil digestif pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=appareil+digestif+pdf
    • http://files.primaryds.com/uploads/1/3/0/8/130873927/e1b3787f.pdf
    • http://files.drsusankentarce.com/uploads/1/3/0/7/130775649/wabividavibomedux.pdf
    • http://files.richardlo.hk/uploads/1/3/1/3/131381363/0a85545c0b1ce1.pdf
    • http://files.tsseafood.com/uploads/1/3/1/3/131379540/4426808.pdf
    • http://felan.resourcesfordoctors.com/uploads/1/3/1/4/131407558/f12f89187af.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/gajumawidip.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9277/files/39537743547.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/salelixakibikiziz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1068/files/migibiwojevireletenigiwot.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1827/files/61107852888.pdf
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/49994482890.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/5332844956.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/54974152107.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4968/files/63142236032.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/nerb_dse_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdf
    • https://cdn.shopify.com/s/files/1/0440/4323/9589/files/dvdvideosoft_free_studio.pdf
    • https://cdn.shopify.com/s/files/1/0440/5071/0693/files/rawikofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/jevatukiguxum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006461.bin
95a2c1115cf48b650077a97855f92d906ebea37685d32cfe3e61dc22cb852b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 5200 bytes
font_01_sfnt_off0000761f.bin
ffaa22dd7a627100faf152bc91e5cfda3bf49325aeeae48a5df6f8b0b14ab742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761F 12112 bytes

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